/**
 * Copyright 2008 Adam Ruggles.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package kiff.service;

import kiff.entity.User;
import kiff.exception.ServiceLayerException;

/**
 * Interface for the User Service.
 * @author Adam
 * @version $Id: UserService.java 64 2008-11-04 07:04:54Z a.ruggles $
 */
public interface UserService extends CoreService<User> {
	/**
	 * Validates the user's credentials.
	 * @param username The username.
	 * @param password The password.
	 * @return A user object if the user is valid, or null if it is not.
	 * @throws ServiceLayerException If an exception occurs in the service layer.
	 */
	User validate(String username, String password) throws ServiceLayerException;
}
